title: Efficient butanol production without carbon catabolite repression from mixed sugars with Clostridium saccharoperbutylacetonicum N1-4.
abstract: Acetone-butanol-ethanol (ABE) fermentation using Clostridium saccharoperbutylacetonicum N1-4 and mixed sugars containing cellobiose and xylose was studied to establish efficient butanol production process without carbon catabolite repression (CCR). Although batch culture with glucose and xylose exhibited apparent CCR, we achieved simultaneous consumption of cellobiose and xylose. Moreover, preculture of the N1-4 strain with xylose yielded maximum butanol and solvent concentrations (16 and 23 g/L, respectively). Thus, we succeeded in ABE fermentation with mixed sugars of hexose and pentose, without CCR, by using wild-type ABE-producing clostridia. We also investigated the effect of various ratios of cellobiose and xylose on the fermentation process and yield. Increasing initial xylose concentration improved butanol and solvent concentrations and maximum xylose consumption rate. Fed-batch culture with cellobiose and xylose showed rapid and simultaneous sugar consumption and improved maximum consumption rate of both sugars.
authors.affiliation: Laboratory of Microbial Technology, Division of Applied Molecular Microbiology and Biomass Chemistry, Department of Bioscience and Biotechnology, Faculty of Agriculture, Graduate School, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. Electronic address: gucci1448@gmail.com.
authors.forename: Takuya
authors.initials: T
authors.lastname: Noguchi
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Tashiro
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Yoshida
authors.forename: Jin
authors.initials: J
authors.lastname: Zheng
authors.forename: Kenji
authors.initials: K
authors.lastname: Sakai
authors.forename: Kenji
authors.initials: K
authors.lastname: Sonomoto
mesh_terms: D020001:1-Butanol / Q000378:metabolism*; D000096:Acetone / Q000378:metabolism*; D061249:Batch Cell Culture Techniques / Q000379:methods*; D056804:Biofuels / Q000382:microbiology*; D057465:Catabolite Repression; D002475:Cellobiose / Q000378:metabolism; D003013:Clostridium / Q000145:classification / Q000378:metabolism*; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D005947:Glucose / Q000378:metabolism; D006601:Hexoses; D010429:Pentoses; D012997:Solvents / Q000378:metabolism; D014994:Xylose / Q000378:metabolism
chemical_list: D056804:Biofuels; D006601:Hexoses; D010429:Pentoses; D012997:Solvents; D000096:Acetone; D002475:Cellobiose; D000431:Ethanol; D020001:1-Butanol; D014994:Xylose; D005947:Glucose
keywords: Acetone–butanol–ethanol fermentation; Carbon catabolite repression; Cellobiose; Clostridium saccharoperbutylacetonicum N1-4; Xylose